Adhesive



Patented Feb. 12, 1935 r ulia 15 1 ;f;or cementing,- taping onisecuringcglass;zcelluloid,

; or other, transparent substances togethenwbizinto ;my;=knowledge;:;no cements itapes or adhesives, in whicharubberwas ,onezoii;theiingrcdientsg-thas 1 been: usedor;,-sold that werestransparentso so approached a, neutral in color. w l It is therefore anothergprimea bjecl'lg ofsmyinvention toprovidefanjjadhesive containing rubber as one of its main ingredients which will be transparent, and which can be successfully used r connecting glass, celluloid, or other transt substances together, the adhesive being e Windshields of automobiles or glass frost 511161 Windshields, window panes and so for securing gla A further impor 1; object of my invention is to provide an adhesi thickness.

A still further salient object or myigyention is the provision of a novel m thod of produ i g the adhesive so as to render the same transparmt 40 and to give the same the proper adhesiveness.

A still further object of my invention is to provide a transparent adhesive which will be efiicient in use, one that will be simple and easy to produce, and one which can be placed upon 45 the market at a reasonable cost. i

With these objects in mind, and without intention to limit the scope of the invention more than is required by the prior art, the invention briefly stated consists in an intermixture of rubber in 50 a large proportion, and the balance in some resin, gum, polymerized products of hydrocarbons, or waxes.

In carrying out my invention, the adhesive composition may be prepared utilizing the fol- 55 lowing formula:

Rubber 100 lbs. Polymerized product of resin 1 to lbs.

There are a number of different kinds of rub- 60 her gums that can be used to produce my transadhesiva; one. found most successfuhsis; that called first latex, which, is one of ;the roup offthe. Hemasbrasiliensis. Otheri rubbers --of thisgroup ,which can-be used ,aresmoke. sheet, -brown;cr,epe, amber-crepe, page crepe, finepara, -and-coarserpara- ::.The:resin. above referred to can be considered as RaraeGoumaroneiCsH4 CHOCH). This :is aa polymerizedproductof resin commercially known as ffC m rz the sam e sa pol rize p dri -q -co ar; d t s- 1. i

carrying out .-my invention, the rubber is preparedbymillingthe same toa plasticity read- ..ing pf three, inaccordance with the practice in rubberlaboratories, with the Goodrich plastome- 1; ,jter; 'Ifhe. milled rubber 'i'sfallowed tostand for 1 :tw'ent ifdllli hOuIS. ",The'rear' rolls of .the mill 'nfei fab yihav a empera re. of 5 to 1 "four'liours," the rubber is niilledagain on a clean mar ne approximately t en' minutes; Theresin is then added to this rubber. After the resin has been added, the mixture is then milled fifteen minutes longer with the use of the appropriately heated rolls. This compound is now allowed to cool and to age for another twenty-four hours. At the end of this time, the compound is then remilled for an additional twenty-five minutes and is then finally run through a colander into the holland sheeting; that is, suitable sheeting to protect each side.

It is obvious that to produce my adhesive the rubber is milled and re-milled, which adds adhesiveness to the composition.

Other formulas can be used, and the following are some of the difierentexamplesz- 1. Rubber, 100 pounds Gums, l. to 5 pounds 2. Rubber, 100 pounds Wax, l to 5 pounds The following are specific examples of wax which can be used in the aboveformula: paraffin wax and beeswax.

3. Rubber, 100 pounds Resins (natural), 1 to 5 pounds.

Resin in the above formula can be considered as the natural resin obtained from pine trees.

4. Rubber, 100 pounds Hydro-carbons, and their derivatives, 1 to 5 pounds.

The hydro-carbons in the above formula are used in their broad sense, but an example of the same is Cumar.

While in all of the examples, I have given the stood that various resins, waxes, gums, etc.; that have a refractive index capable of mixed with raw rubber and producing a transparent compound, can be used. r

While I have described a specific procession manuiacturing my transparent adhesive, .it should be understood that variations in the plas-' ticity and also in detailsot processing maybe varied. It maybe desirable not to manipulate until the plastometer is reading 3, also'it may V ingthe batch or rubber 'oiia clean mill for ap-,

- not be desirable to mill, calender, age, etc., ex-

actly as stated in the example-given, for processing must vary, depending upon thecolor'and' other properties oi the rubber and other ,ma-

terials, such as resin used in a given mixture,

The invention is to include not only ahomogeneous mixture, but any combination of the ingredients. For example, a solution'of mastic of proper adhesive qualities might be applied to the surfaceoi the prepared rubber sheeting and allowed to 'dry to the point where the desired tack is present, and then covered with hollandcloth.

,Also, it maybe found desirable to apply a solid ferred to in my. composition is native: or raw rubber, and thisrubber is utilized in an unvulcanized condition. V 7

Having thus described my invention, what I claim'as-new. is: I a

L'The method of making a transparent and substantially colorless adhesive which consists in ilrst milling raw rubber an plasticity; allowing the rubber to age; re-milling the rubber and then adding a resin therein, then milling the mixture with heated rolls; then aging the milled mixture and finally re -mllling the mixture and running 7 fthe-sam'e into'solid, pliableljsheets. 2. The method oi a transparent substantially colorless adhesive. which consists in first milling a batch of raw-milled rubber to a l-plasticity. reading of three .with the Goodrich plastometer; allowing theinilled batch of rubber to'stand and'age tor twenty iour hours, re-mill- 1 proximately ten minutes and thenadding, a small quantity of resin thereto; then milling the mixture for a period oirat least fifteen minutes; al-

lowing the mixture to cool and age iortwentyiourihours; and re-milling the mixture for ani additional twenty-five minutes and runn zthesam'ein'tosheets." 3

solved in a'solvent, which consists in, first, milling raw rubber" to s plasticity; allowing 1 the milled rubber toage; re-fmilling" the rubber and then addingla substancmtherdtg having a retracted i .index compatible therewijthfor increasing the of the rubberrthen, milling the mixture;

then, re-aging the milled mixture; ilnally,

e-miHingthe V V V g I 

